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Hashset vs Treeset
...t.
It's quite safe to accept default load factor but you may want to specify an initial capacity that's about twice the size to which you expect the set to grow.
TreeSet
guarantees log(n) time cost for the basic operations (add, remove and contains)
guarantees that elements of set will be sor...
XmlSerializer giving FileNotFoundException at constructor
...mal behaviour. An exception is thrown but handled by the XmlSerializer, so if you just ignore it everything should continue on fine.
I have found this very annoying, and there have been many complaints about this if you search around a bit, but from what I've read Microsoft don't plan on doing anyt...
In mongoDb, how do you remove an array element by its index?
...he comments this approach is not atomic and can cause some race conditions if other clients read and/or write between the two operations. If we need the operation to be atomic, we could:
Read the document from the database
Update the document and remove the item in the array
Replace the document i...
What is the difference between pluck and collect in Rails?
...ill only query the particular field. See this.
When you do:
User.first.gifts.collect(&:id)
You have objects with all fields loaded and you simply get the id thanks to the method based on Enumerable.
So:
if you only need the id with Rails 4, use ids: User.first.gifts.ids
if you only need ...
Android Use Done button on Keyboard to click button
...ean onEditorAction(TextView v, int actionId, KeyEvent event) {
if ((event != null && (event.getKeyCode() == KeyEvent.KEYCODE_ENTER)) || (actionId == EditorInfo.IME_ACTION_DONE)) {
Log.i(TAG,"Enter pressed");
}
return false;
}
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UnicodeDecodeError, invalid continuation byte
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In binary, 0xE9 looks like 1110 1001. If you read about UTF-8 on Wikipedia, you’ll see that such a byte must be followed by two of the form 10xx xxxx. So, for example:
>>> b'\xe9\x80\x80'.decode('utf-8')
u'\u9000'
But that’s just the mechanical ca...
.Net HttpWebRequest.GetResponse() raises exception when http status code 400 (bad request) is return
...
It would be nice if there were some way of turning off "throw on non-success code" but if you catch WebException you can at least use the response:
using System;
using System.IO;
using System.Web;
using System.Net;
public class Test
{
s...
Compare a string using sh shell
...shell and I am trying to compare a string with a variable's value but the if condition is always execute to true. Why?
7 ...
What is the equivalent of the C++ Pair in Java?
...alue as a primitive or built-in class without encapsulating it in a class. If we were to return a tuple of a dozen elements no one would disagree it should have its own class. Somewhere in the middle is a (fuzzy) dividing line. I think our lizard brains can cope with Pairs easily enough.
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Creating a blocking Queue in .NET?
...hreads adding to a queue and multiple threads reading from the same queue. If the queue reaches a specific size all threads that are filling the queue will be blocked on add until an item is removed from the queue.
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